concat::fragment does not load source from modules

When using concat::fragment with a source pointing to a puppet:/// module file it fails to load it:

$route_file = "/etc/sysconfig/network-scripts/route-${device}"

concat

concat::fragment { "routes_${device}_header":
target => $route_file,
source => 'puppet:///modules/xxx/header',
order => 00,
}

Error: /Stage[main]/Machine/Network[eth0]/Concat[/etc/sysconfig/network-scripts/route-eth0]/Concat_file[/etc/sysconfig/network-scripts/route-eth0]: Failed to generate additional resources using 'eval_generate': Could not intern from application/octet-stream: No format match the given format name or mime-type (application/octet-stream)

===

So to verify the source is working properly, path is correct and client can fetch it I added a file resource:

file

And client successfully fetches it successfully:

Notice: /Stage[main]/Machine/Network[eth0]/File[/tmp/puppet-source-test]/ensure: defined content as '

80065d60ff682b5796a0968a50e83cce'